Journal
ELECTROCHIMICA ACTA
Volume 199, Issue -, Pages 12-17Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.03.112
Keywords
rotating disc voltammetry; methanol oxidation; faradaic efficiency; electrocatalysis; mass transport
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada
- Memorial University
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Rotating disc voltammetry of 0.1 M methanol at thick catalyst layers shows significant increases in current with increasing rotation rate. Although a mass transport limited current was not reached, due to inhibition of methanol oxidation by Pt oxide at high potentials, linear Koutecky-Levich plots were obtain in the mixed kinetic-mass transport region. For a carbon supported Pt catalyst, the slopes of the Koutecky-Levich plots corresponded to a methanol oxidation efficiency of ca. 50% (average n-value of 3.1 electrons per molecule), while the efficiency was ca. 100% for a PtRu black catalyst. The methanol diffusion coefficient obtained with the PtRu black catalyst was in good agreement with literature values. Koutecky-Levich plots provide mass transport corrected kinetic currents, in the mixed kinetic-mass transport region, that complement values obtained at lower potentials by cyclic voltammetry or at constant potential. (C) 2016 Elsevier Ltd. All rights reserved.
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